first it was a flat worm issue, now i have this red algae ( i think its Chondria) that is growing out of control. i have cut feeding back to once a week for the fish and not coral food at all. i have been on this feeding schedule for about 2 months but the problem still continues. i am running the stock skimmer and one unit of chemipure elite. i also have some cheato in one of the rear chambers with a light cycle opposite that of the display.
the only things i can think of are, bad salt, bad water (using bottled distilled from the store), or the tank is some how making its own. is it possible that the distilled water (bottles say "distilled from steam") is not really distilled?
i cleaned out the back chambers, they were pretty clean already but just in case i vacuumed them out. i also perform weekly 2.5 gallon water changes.
tests are all coming back seemingly normal
nitrate 0
nitrite 0
ammonia 0
PH 8.3
CA 480
ALK ~9
opinions?
fish seem normal and corals are all growing well, even the couple SPS i have are doing well. everyone seems healthy.
opinions, suggestions?

